Occurrence of symptomatic lymphocele after open and robot-assisted radical prostatectomy

INTRODUCTION: The aim of this article was to evaluate the prevalence and predictors of symptomatic lymphocele after open retropubic radical prostatectomy (RRP) and robot-assisted radical prostatectomy (RARP). MATERIAL AND METHODS: A total of 472 patients undergoing RRP (n = 241) or RARP (n = 231) were retrospectively analyzed with a 2-year follow-up for age, body mass index (BMI), total serum prostate-specific antigen (PSA), lymphocele formation and histopathological features. Univariate and multivariate logistic regression models were used to identify independent predictors of symptomatic lymphocele. RESULTS: Patients undergoing RRP developed significantly less overall lymphoceles than after RARP (8.2% vs 16.7%; p = 0.049), but no difference was determined for symptomatic events requiring intervention (7.4% vs 11.7%, p = 0.315). Although more pelvic lymph node dissections (PLND) were performed during RARP (70.1% vs 50.6%; p <0.001), significantly more cases with lymphatic invasion were observed after RRP (18% vs 6.2%, p = 0.002). The median lymph node yield during RRP and RARP were 11 and 10, respectively (p = 0.381). In multivariate logistic regression, we identified the number of dissected lymph nodes (n = 11) (OR 1.1; 95% Cl 1.055 - 1.147; p = 0.001), the Gleason score ≥ 8 (OR 4.7; 95% Cl 2.365 – 9.363; p = 0.001) and the total PSA ≥10 ng/ml (OR 1.05; 95% Cl 1.02 – 1.074; p = 0.001) as independent predictors for the development of symptomatic lymphocele. CONCLUSIONS: Next to an extended lymph node yield, high-grade disease was associated with a higher risk to develop symptomatic lymphocele irrespective of the technical approach. The identification of risk factors might prove valuable in clinical practice when assessing and counselling patients considering surgical treatment of prostate cancer.